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s390x/tcg: deliver multiple interrupts in a row

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We have to consider all deliverable interrupts.

We now have to take care of the special scenario, where we first
inject an interrupt with a WAIT PSW, followed by a !WAIT PSW. (very
unlikely but possible)

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180129125623.21729-2-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2018-01-29 13:56:06 +01:00 committed by Cornelia Huck
parent 12f15c9155
commit ce204cba74
1 changed files with 16 additions and 4 deletions
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20
target/s390x/excp_helper.c
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@ -433,10 +433,12 @@ void s390_cpu_do_interrupt(CPUState *cs)
{
S390CPU *cpu = S390_CPU(cs);
CPUS390XState *env = &cpu->env;
bool stopped = false;
qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n",
__func__, cs->exception_index, env->psw.addr);
try_deliver:
/* handle machine checks */
if (cs->exception_index == -1 && s390_cpu_has_mcck_int(cpu)) {
cs->exception_index = EXCP_MCHK;
@ -479,13 +481,14 @@ void s390_cpu_do_interrupt(CPUState *cs)
break;
case EXCP_STOP:
do_stop_interrupt(env);
stopped = true;
break;
}
/* WAIT PSW during interrupt injection or STOP interrupt */
if (cs->exception_index == EXCP_HLT) {
/* don't trigger a cpu_loop_exit(), use an interrupt instead */
cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HALT);
if (cs->exception_index != -1 && !stopped) {
/* check if there are more pending interrupts to deliver */
cs->exception_index = -1;
goto try_deliver;
}
cs->exception_index = -1;
@ -493,6 +496,15 @@ void s390_cpu_do_interrupt(CPUState *cs)
if (!env->pending_int) {
cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
}
/* WAIT PSW during interrupt injection or STOP interrupt */
if ((env->psw.mask & PSW_MASK_WAIT) || stopped) {
/* don't trigger a cpu_loop_exit(), use an interrupt instead */
cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HALT);
} else if (cs->halted) {
/* unhalt if we had a WAIT PSW somehwere in our injection chain */
s390_cpu_unhalt(cpu);
}
}
bool s390_cpu_exec_interrupt(CPUState *cs, int interrupt_request)